The Effect of Different Surface Treatments on the Color Stabilities of Lithium Disilicate Material

Abstract

Background: The aim of this study is to investigate the clinical acceptability of the color change that may occur in time about full ceramic materials used for aesthetic restorations, which are bonded after different surface conditioning processes, by measuring with spectrophotometer. Methods: The lithium disilicate CAD material we used in our work was prepared with isomet in the form of 1-millimeter-thick specimens. Three random groups of 21 specimens were selected from the specimens. One of these groups was conditioned with phosphoric acid, which is recommended by the manufacturer. Er:YAG laser was applied to the second group. The third group was conditioned by Nd:YAG laser. Surface changes in the groups were evaluated by scanning electron microscope (SEM) and atomic force microscope (AFM). The specimens were bonded with the adhesive resin cement to the background material for color change measurement. The first color measurement of the bonded specimens was done by spectrophotometer. The specimens were aged at 10,000 cycles in the thermal cycle device. The second color measurement after aging was done with the same spectrophotometer. Results: After aging with thermal cycle, there was a clinically acceptable color change in all groups. The Nd:YAG laser group presented better color stability (p<0.05). The SEM and AFM images presented different surface morphology on laser groups. Conclusion: It has been determined that the color change in the lithium disilicate material bonded after different surface conditioning processes is clinically acceptable. The specimens conditioned with Nd: YAG have the best color stability.

Keywords

• Lithium disilicate
• Atomic force microscopy
• Lasers
• Aging
• Color

The Effect of Different Surface Treatments on the Color Stabilities of Lithium Disilicate Material

Abstract

Amaç: Bu çalışmanın amacı, farklı yüzey işlemlerinden sonra yapıştırılan lityum disilikat restorasyonlarda zamanla oluşabilecek renk değişiminin spektrofotometre ile ölçülerek klinik olarak kabul edilebilirliğini araştırmaktır. Gereç ve Yöntemler: Çalışmamızda kullandığımız lityum disilikat materyali 1 milimetre kalınlığında numuneler şeklinde hazırlandı. Hazırlanan örneklerden, her biri rastgele seçilmiş 21 örnek içeren üç grup oluşturuldu. Birinci grup, üretici tarafından tavsiye edilen fosforik asit ile işlem gördü. İkinci gruptaki örnekler Er:YAG lazere tabi tutuldu. Üçüncü gruptaki örneklere ise Nd:YAG lazer uygulandı. Gruplardaki yüzey değişiklikleri taramalı elektron mikroskobu (SEM) ve atomik kuvvet mikroskobu (AFM) ile değerlendirildi. Numuneler, renk değişimi ölçümü için adeziv rezin siman ile arka plan malzemesine yapıştırıldı. Yapıştırılan numunelerin ilk renk ölçümü spektrofotometre ile yapıldı. Numuneler, termal döngü cihazında 10.000 döngü ile yaşlandırıldı. Yaşlandırma sonrası ikinci renk ölçümü aynı spektrofotometre ile yapıldı. Bulgular: Termal döngü ile yaşlandırma sonrasında tüm gruplarda klinik olarak kabul edilebilir bir renk değişimi olmuştur. Nd:YAG lazer ile işlem gören grup daha iyi renk kararlılığı göstermiştir (p<0.05). SEM ve AFM görüntüleri incelendiğinde fosforik asit uygulanan grubun lazer gruplarına göre farklı yüzey morfolojisine sahip olduğu gözlendi. Sonuç: Farklı yüzey işlemlerinden sonra yapıştırılan lityum disilikat örneklerde renk değişiminin klinik olarak kabul edilebilir olduğu belirlenmiştir. Nd: YAG lazer ile işlem görmüş örnekler en iyi renk stabilitesine sahiptir.

Keywords

• Lityum disilikat
• Atomik kuvvet mikroskopisi
• Lazerler
• Yaşlanma
• Renk

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